Core



Patented June 14, 1932 UNITED STATES "PATENT OFFICE ARTHUR T. RICHARDSON, 'OF GENEVA, ILLINOIS CORE Application filed. July 31, 1930. Serial No. 471,996.

'. housmgs.

It should be understood that a journal is usually formed of an outer support or casing of cast material, usually cast iron within the bore of which is formed a bushing of anti-friction journal material. Various expedients have been employed in the past for securing the anti-friction material forming the bushing to the inner surface of the housing. The usual method is to provide the inner surface of 1 the housing with a plurality of depressions.

These depressions may be formed in any convenient manner in the casing and it is usual to form these depressions in the casing during the casting operation by which the casing is formed, and my present invention particularly contemplates a new way of forming these anchoring depressions in the journal casing during the casting thereof.

One of the important objects of my present invention is to provide a cup shaped tack core,

which said core may be used by setting it in the mold in which the parts are formed in such a way that the mouth of the cup will open on the surface of the journal part to which the anti-friction bushing is to be applied, while the body of the cup is imbedded in the casing part.

Still another object of the invention resides in providing the novel method of forming babbitt anchoring sockets, which consists in placing a cup shaped tack core in a mold in such a way that the material which forms the babbitt support is formed around the cup, which is imbedded therein and thus forms a part of the bearing support.

Another important object of the invention resides in the provision of an article'comprising a body having cup shaped members embedded in a surface thereof and opening ontosaid surface whereby to provide antifrictlon metal anchoring sockets in the part.

Numerous-other objects and advantages of the invention will be apparent as it is more fully understood from the foregoing description which taken in connection with the accompanying drawing discloses a preferred embodiment of my invention.

Referring to the drawing:

Figure 1 is a fragmentary section taken through a mold arranged for casting a support for anti-friction metal;

Figure 2 illustrates a fragment of a bearing support such as might be cast in the mold I illustrated in Figure 1, said fragment having anti-friction anchor sockets formed in accordance with the teaching of my present invention; and v Figure 3 is an enlarged perspective View of a cup shaped tack core embodied in my present invention, part of the device being shown broken away to more fully reveal the details of its construction.

I Toillustrate my invention I have shown on the drawing in Figure 1 a fragmentary cross section taken through an ordinary sand mold arranged for casting a support member for anti-friction material in accordance with my present invention; 'The mold comprises tl e usual upper or cope section 13 and the lower or drag section 11 arranged on either side of the parting plane 15, the co-operating surfaces of the cope and drag being suitably'configurated to provide a mold cavity 19 suit able for casting a support member adapted to have a layer of anti-friction metal formed to a surface thereof for the purpose of providing a bearing.

The mold also has a suitable duct 17 leading from outside the mold to the molding cavity: and through which the material used" in casting may be poured into the cavity. In the illustrated mold, the drag portion is designed to form the surface in the finished product to which the layer of antisfriction material is applied in making a bearing. Accordingly, provision is made for coring out anti-friction material anchor sockets and these provisions according to my present invention consist in arranging a plurality of cupshaped tack cores 21 at such points in the configurated surface of the drag portion of the mold as are adapted to form the surface in the finished product to which the antifriction material is to be applied. These tack cores comprise hollow inverted conical receptacles provided with prongs 23 projecting from the edge of the cup. These cores can be easily and cheaply manufactured from any suitable sheet metal such as the tin plate and can be turned out in vast quantities on punch presses. When the tack core is in use the prongs 23 are punched into the sand forming the mold and so are retained in place during the pouring operation, while the molten metal is flowing into the mold cavity. The cup shaped portion of the tack cores will thus become surrounded by the molding material and will become imbedded therein to provide conical depressions in the surface of the molded article.

Figure 2 illustrates the finished product after it is removed from the mold in which it was cast. The prongs 23 may be cut off or simply hammered flat against the surface of the casting mold to prepare the same for receiving the lining of anti-friction metal.

In order to facilitate the removal of the prongs I may provide score lines 24; at the base of the prongs where they join the cup shaped portion of the tack core. These scores may be formed by cutting about half way through the stock with a blunt chisel cut, so that the prongs break off quite readily, if brushed vigorously.

An important advantage arising from the use of tack cores such as are illustrated in Figure 3 of the drawing is that the anchor sockets may be formed with diameters increasing away from the surface of the casting so that when the anti-friction metal is applied, the same will interlock in the anchor sockets.

A further advantage resides in the fact that there is no need to dig the packed sand core out of the anchor sockets before applying the anti-friction material to the surface of the casting.

It is thought that the invention and numerous of its attendant advantages will be clearly understood from the foregoing description and it is obvious that numerous changes may be made in the form, construction and arrangement of the various parts Without departing from the spirit and scope of the invention or sacrificing any of its attendant advantages, the form hereinbefore described beinga preferred embodiment for the purpose of illustrating my invention.

Having thus described my invention What.

wardly from the edge of the cup to its base and having prong-like projections formed at, its edge.

2. A tack core comprising a cup shaped member of sheet metal having conical walls sloping outwardly from the rim of the cup to its base and having means formed on its rim for mounting the member in a mold.

In witness whereof, I have hereunto subscribed my name.

ARTHUR T. RICHARDSON. 

